核心代码：
DataSet ds = dBll.GetList("ID=" + ID);
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string docName = "a.doc";//文件名，
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byte[] file = (byte[])ds.Tables[0].Rows[0]["FContent"]; // "FContent"类型为image
string Type = checktype(docName);
Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(docName, System.Text.Encoding.UTF8).Replace("+", "%20"));
Response.AddHeader("Content-Length ", file.Length.ToString());
Response.ContentType = Type;
Response.BinaryWrite(file);//可以下载二进制文件，如数据库存的image
//Response.WriteFile(fliePath);可以下载路径文件
Response.End();
Response.Clear();
/// <summary>/// 根据文件的扩展名来获取对应的“输出流的HTTP MIME“类型/// </summary>/// <param name="filename"></param>/// <returns></returns>private string checktype(string filename)
{ string ContentType;
switch (filename.Substring(filename.LastIndexOf(".")).Trim().ToLower())
{
case ".asf ":
ContentType = "video/x-ms-asf ";
break;
case ".avi ":
ContentType = "video/avi ";
break;
case ".doc ":
ContentType = "application/msword ";
break;
case ".zip ":
ContentType = "application/zip ";
break;
case ".xls ":
ContentType = "application/vnd.ms-excel ";
break;
case ".gif ":
ContentType = "image/gif ";
break;
case ".jpg ":
ContentType = "image/jpeg ";
break;
case "jpeg ":
ContentType = "image/jpeg ";
break;
case ".wav ":
ContentType = "audio/wav ";
break;
case ".mp3 ":
ContentType = "audio/mpeg3 ";
break;
case ".mpg ":
ContentType = "video/mpeg ";
break;
case ".mepg ":
ContentType = "video/mpeg ";
break;
case ".rtf ":
ContentType = "application/rtf ";
break;
case ".html ":
ContentType = "text/html ";
break;
case ".htm ":
ContentType = "text/html ";
break;
case ".txt ":
ContentType = "text/plain ";
break;
default:
ContentType = "application/octet-stream ";
break;
}
return ContentType;
} |
HttpUtility.UrlEncode(docName, System.Text.Encoding.UTF8).Replace("+", "%20"));这个可以解决中文文件名中包含空格的问题，UrlEncode编码后会把文件名中的空格转换中+（+转换为%2b），但是浏览器是不能理 解加号为空格的，所以在浏览器下载得到的文件，空格就变成了加号；
解决办法：UrlEncode 之后, 将 “+” 替换成 “%20″，因为浏览器将%20转换为空格